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CryptoHack

A free, fun platform for learning modern cryptography

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Learn By Doing

Learn about modern cryptography by solving a series of interactive puzzles and challenges. Get to know the ciphers and protocols that secure the digital world by breaking them.

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Level Up

Earn points by solving challenges. Finish categories to earn trophies and gain levels to track your progress. Can you reach the top of the scoreboard?

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Fresh Challenges

We are constantly creating new challenges to keep your crypto knowledge up to date. Expect exciting brainteasers and whole new categories as the site continues to grow.

New Challenges
Do you have good eyes? (Breizh CTF) CTF Archive 0
RSATogether (ECSC 2024 (Italy)) CTF Archive 0
Authentification 1 (Breizh CTF) CTF Archive 0
One Round Crypto (ECSC 2024 (Italy)) CTF Archive 0
Greatest Common Multiple (CODEGATE CTF) CTF Archive 0
Weekly Top Users
#1 Tabaxi3K 6960
#2 hanz 2285
#3 Yu_212 1745
#4 AACDAI 1570
#5 naraoia 1295
Recent Solves
Modular Exponentiation abbeycat
Curves and Logs slasymachus
Modular Arithmetic 1 brambleclaw
Manyprime Rayzu
Scalar Multiplication slasymachus
Recent Solutions
L-Win Nhan_LAPTOP 0
Decrypting TLS 1.2 ConnorM 0
XOR Properties Brolupyr777 0
Nativity xtea418 0
Efficient Exchange Etern1ty 0

Level Up

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